I bought a Barlow today of SAR. It isn't top of the line but it should do OK with the scope which isn't top quality either. It is a Celestron Omni 2x. The 20x eyepiece is also a Celestron Omni so it should, in theory anyway, be optimized to work well with the eyepiece. Here is the rather extensive description of the lens from the Celestron Web site:
The Omni Barlow is a high quality 2x Barlow lens that doubles the magnification of all 1.25" eyepieces. This economically priced Barlow has great features like, low profile, 2-element fully-multicoated optical design and blacked lens edges.
Now we are back into bad weather so I guess it will be a while before I get a chance to try it out.
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